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At a college, 70% of students are female, and 50 percent of students receive a grade of C. Twenty-five percent are neither female nor C students.Complete a probability matrix and answer the followin
A fast food outlet claims that the mean waiting time in line is less than 3.7 minutes. A random sample of 20 customers has a mean of 3.5 minutes with a standard deviation of 0.8 minute. if a = 0.05,
A researcher is investigating the relationship between personality and birth order position. A sample of college students is classified into four birth categories (1st, 2nd, 3rd, 4th, and later)and
Carry out the steps in constructing a confidence interval for a population proportion: define the parameter; check conditions; perform calculations; interpret results in context.
Provide an example of where you think a graphical display could be used incorrectly. What ramification(s) do you think could result from the graphical display in your example being used incorrectly?
Complete the table by computing total revenue, marginal revenue, and the price elasticity of demand. USE THE MID POINTS FORMULA.
The probability of pass a test is 0.76 at a particular school. Suppose we randomly select a class of 10 students from this school. The following questions deal with this class of 10 students. What
What's a difference between the z distribution and the t distribution?
The average magnesium concentratioin in ground water around Metro City is (mu)=65.6 parts per million (ppm) with a standard deviation of standard deviation of 10. The table below shows the gound wat
A survey of 1373 parents and 1343 students in grades 6-12 regarding the importance of science and mathematics in the school curriculum found that 50% of students thought that understanding science a
In a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damaged heart, 110 people who consented to treatment were assigned at random to either a standard t
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000. Assume that a 95% confidence interval estimate of the
A manufacturer claims that its televisions have an average lifetime of at least five years (60 months) with a population standard deviation of 7 months. 81 televisions were selected at random, and
What is the minimum number of tellers required for there to exist a steady state for this queuing system? What is the minimum number of tellers required to meet the 2-minute criterion?
The eagle ridge contractors association claims the average price of a home in thier subdivision is $125,150 with a standard deviation of $7,350. A sample of 36 homes for sales in this subdivision ha
Customers arrive at a thrift bank according to a poisson distribution with a mean of 45 customers per hour. Transactions per customer last about 5 minutes and are exponentially distributed.
If the same mean is 11, the hypothesized population mean 10, and the population standard deviation is 4, compute the test value needed for the z test.
Write the hypothesis statements. Explain what test statistic will be used and why. Compute the test statistic.
Construct a 95% confidence interval estimate of the proportion of medical malpractice suits that were dropped or dismissed? Does it appear that a majority of such suits were dropped or dismissed?
The value of the linear correlation coefficient is reported by an investigator to be 0.55. Based on this statistic we can conclude that: 55% of the variability in the predictor can be explained by t
The standard normal table shows an area value of 0.8 for a z-score of 0.84. What percentage of the observations of a random variable that is normally distributed will be more than 0.84 standard devi
Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decima
For the test of equal population means versus unequal population means, the absolute value for the computed test statistic, the critical values, and the p-value respectively are:
The accompanying data are x = advertising share and y = market share for a particular brand of cigarettes during 10 randomly selected years.
A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the proportion of all voters in the state who favor